[Diogenes]

I'm no martial artist myself, but when I stumble upon boxing contests on TV, I see that boxers parry blows with the arms. Therefore, the parry has to be relearned for bladed weapons, makeing it a technique based on the boxing parry, giving some DR protecting the hand if the parry was successful.

But I'm afraid that the blade would have a nasty tendency to glide along the brassknuckles, effectively being guided to the hand or arm by the very object that is supposed to protect the limb in the first place. So it might make sense as a secret technique for cinematic games, but would not make sense in a realistic game. If it would be (relatively) easy, or possible at all, it would be a common technique in one of the most prominent Western martial arts, i.e. boxing, for a long time.